Survival outcomes for congenital heart disease from Southern Malaysia: results from a congenital heart disease registry

Abstract

Objective: Limited population-based studies are available on the survival of congenital heart disease (CHD) from lower- and middle-income countries. Therefore, we evaluated the survival from birth until 15 years and associated factors for mortality.

Methods: This population-based cohort study included all children with CHD registered in the Pediatric Cardiology Clinical Information System born between 2006 and 2020 in Johor, Malaysia. The mortality rate was calculated, and Cox proportional hazard regression analysis was used to determine factors associated with mortality. The Kaplan-Meier analysis was used to estimate the survival rates at 1, 5, 10 and 15 years.

Results: There were 5728 patients with CHD studied, with 1543 (27%) lesions resolved spontaneously, 322 (5.6%) were treated with comfort care, 1189 (21%) required no intervention, and 2674 (47%) needed surgery or intervention. The overall mortality rate was 15%, with a median age of death of 3.7 months (IQR 0.9-9.8 months). Preoperative/intervention death was observed in 300 (11%), and 68 (3.2%) children died within 30 days of surgery or intervention. The overall estimated survival at 1, 5, 10 and 15 years was 88%, 85%, 84% and 83%, respectively. The independent factors associated with mortality were male gender, associated syndrome or extra-cardiac defect, pulmonary hypertension, antenatal diagnosis and severe lesions.

Conclusions: Eight out of 10 patients with CHDs survived up to 15 years of age. However, 10% of CHDs who require intervention die before the procedure. Thus, improving congenital cardiac surgery and enhancing the overall healthcare system are crucial to improve survival.

Keywords: Cardiology; Epidemiology; Mortality; Paediatrics.